There is an exponential decline of bed material particle size as you move downstream due to the fining as a result of abrasion and sorting. Smaller particles are preferentially entrained and transported creating a set of bedforms. The most common are pool-riffle sequences which are characteristic of many single-channel alluvial rivers (Carling & Orr, 2000). They form as a series of rifles and intervening pools (Figure 1). Shallows are formed by high points in the channel called riffles. The deep reaches that supersede are known as pools.
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